Very weak Airport Extreme Base Station signal...

Hi --
I've been searching the forums here for some solution but haven't been able to find anything. I'm trying to upgrade my parent's wireless network in their home and they've had an Airport Extreme base station for a couple of years now. I recently switched them to broadband which is much faster than the crappy DSL they used to have but the problem that still exists (one that they've always had) is an incredibly weak Airport Base Station signal.
I've tried using different laptops and computers on it, but all of them register the same weak signal. Having my laptop 12 inches from the base station only gives me three bars. From three feet away it drops to two and anything over six feet is a 1 bar or nothing and that's all int he same room. Trying to access it from an adjacent room is fruitless.
Like I said, it's like this for all computers I've tested. Anyone know what's up with this? Is the base station on the fritz? I have the latest software update for it as far as I know.
Thanks.

That's a good, helpful list but we don't really have any of those potential interfereces. Like I said, this signal is down to two bars from five feet away and only three bars from literally six inches away, so there's really not a lot of room for intererence from that distance anywat.
I've seen people wondering if the latest firmware update for Airport might be causing this, but I'm wondering if the Airport base station itself is maybe in the fritz. I guess I could try getting a new one. Anyone else out there have any other ideas?

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